Rackmount Server: A server is a computer that handles requests for data, email, file transfers, and other network services from other computers. Your server(s) will be mounted in the rack. A rack is a metal framework that houses server(s).The space used by your server(s) is measured in Rack Units ( U-Space ). A full rack can contains 40 to 42U 1/4 Rack=10U (10 servers of 1U) Half rack =20 U . What is 1U?.